Malicious PDF — malware analysis report

Static analysis result for SHA-256 df818e084b817163…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 16:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9a0511689dcc1e26e8fac4eee6fe641 SHA-1: bbbd42b2081a0e3996e20b018f5a6137240ed65f SHA-256: df818e084b8171637270e0e0ea06c629af9862c3d8aa12d0004adbe4a855ee43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://millvalley.com/wysiwygfiles/file/94140004074.pdf In PDF document text
    • http://bygreenpure.com/userfiles/file/fanuzuxurataroje.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/42252931902.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c637050ab---wunanibepupanofuf.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b19e03340582b422f285fd53f012abf8/dupezewegivubevosaluzakod.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/lemotonukaxitomidofumaka.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614390fdc8810---30058048750.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/49805516750.pdfIn PDF document text
    • http://delve-cr.com/uploads/jajupasugexapafinijatasob.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff08f312bb---88745298386.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b303dc8406---kavefipem.pdfIn PDF document text
    • http://195exim.com/datas/files/midiwa.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/wufumadazig.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/razuzolipovemitoxepib.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/nasavitusozexijumaraz.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/53657166529.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/rajepukurorati.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/vofavijenakusow.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/botakafebuzax.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/pazavijudobup.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/79688404503.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/25889714616.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021914611229311.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/xaregul.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/nebelinov.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/majapugefipas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+block+numbers+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 10844 bytes
SHA-256: 465e090d432365dc061b6cf57b9c678a004813cce916aafe8b32ec76f9779c59
font_01_sfnt_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A3 18400 bytes
SHA-256: 6820cdd0a1b88d561cb06f0355d5a0ae60b3e91306cac6a0cfbc32cb8e80b387

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